Image processing apparatus, image processing method, and program

An image processing apparatus comprising:

• an acquisition unit configured to rotate an image reading unit including a sensor in units of predetermined angles to read a white reference member and acquire luminance information about the white reference member at the respective predetermined angles of rotation;
• a determination unit configured to determine an angle at which an amount of change of the luminance information is greater than or equal to a predetermined value among a plurality of pieces of the luminance information acquired by the acquisition unit at the respective predetermined angles;
• and
• a rotation control unit configured to calculate a tilt angle of the image reading unit based on the angle determined by the determination unit, and rotate the image reading unit to correct the calculated tilt angle.

A method for image processing, the method comprising:

• rotating an image reading unit including a sensor in units of predetermined angles to read a white reference member, and acquiring luminance information about the white reference member at respective predetermined angles of rotation;
• determining an angle at which the luminance information is greater than other pieces of the luminance information among a plurality of pieces of the acquired luminance information at the respective predetermined angles;
• and
• rotating the image reading unit based on the determined angle to correct a reference position of the image reading unit.

A method for image processing, the method comprising:

• rotating an image reading unit including a sensor in units of predetermined angles to read a white reference member, and acquiring luminance information about the white reference member at respective predetermined angles of rotation;
• determining an angle at which an amount of change of the luminance information is greater than or equal to a predetermined value among a plurality of pieces of the acquired luminance information at the respective predetermined angles;
• and
• calculating a tilt angle of the image reading unit based on the detected angle, and rotating the image reading unit to correct the calculated tilt angle.